Design and Numerical Simulation of Displacement Sensor Based on Liquid Antenna

This paper provides a new design of passive wireless displacement sensor based on liquid antenna. Depending on the electromagnetic theory, there is an approximate linear relationship between the shift of water column height in the cavity and the resonant frequency of the liquid monopole antenna. In this paper, numerical analysis and parameter optimization are performed through High Frequency Structure Simulator (HFSS). The final optimization results show that the sensor has good linearity and sensitivity within the determined range.